Each of these breaks a general rule about metals or non-metals.

Metals are usually shiny, hard, malleable, ductile, sonorous and good conductors, with high melting points. Non-metals are usually dull, brittle and poor conductors. Exceptions: mercury is liquid, sodium is soft and floats, graphite conducts, iodine is shiny, diamond is very hard. Metalloids such as silicon have properties of both.